Extruded polystyrene foam (EPS), known in our country under the Penoplex trademark, is a popular material for insulating facades, foundations, loggias, and roofs. Let’s talk about the ways in which expanded polystyrene can be attached to the wall to make it reliable and durable.
Before proceeding with the insulation, it is necessary to prepare the surface to which the expanded polystyrene will be attached. If the wall is stone, brick, concrete, you should follow these steps:
- Clean the surface from dust, old paint, accumulated dirt;
- Treat with antiseptics so that fungus probably does not start under the insulation;
- Remove efflorescence, which is often found on brick walls;
- If there are cracks, close up;
- If there are irregularities, correct the situation with a putty;
- Apply a deep penetration primer.
With wooden walls it is a little easier, they also need to be treated with antiseptics against fungus and rotting, and then equip the base from a bar. You will get an insulated ventilated facade.
After preparing the walls, a starting plinth is attached along the entire perimeter of the insulated facade. It will not allow the penoplex to move down, will help to work comfortably, observing the geometry of the insulation laying. It is important to fix the bar strictly along the horizon, the necessary measurements are first carried out. The starting bar can be made with your own hands from a wooden bar, but it is more convenient to use a perforated metal profile. The width of the profile should correspond to the thickness of the insulation, the fasteners come with the required number of internal and external corners.
Then you can proceed to laying the foam on the wall using one of five options:
- Bituminous-polymer mastic. This is a popular way to install insulation. There are special brands specifically for expanded polystyrene, adhesives are most often sold ready-made. The mastic is applied to the insulation plate in separate points – in the corners, it is possible along the perimeter, always in the center. Then the penoplex is pressed against the wall, you will have to wait a little while it attaches;
Important! Experts advise rolling the side of the insulation plate to which the adhesive will be applied with a needle roller. This will create a roughness and increase adhesion..
- Dry mixes based on cement. Such mixtures will have to be diluted with water, mixing with a construction mixer. The finished mixture is applied over the entire surface of the expanded polystyrene board with a notched trowel. Then the insulation is pressed against the wall;
- Foam glue. Sold in the form of cylinders. Most often, using foam glue, EPPS is attached to gypsum or plastic surfaces;
- Insulation dowel. Simple and reliable, therefore, a popular type of fastener. Disc dowels can be different, with plastic or metal nails;
- Liquid Nails. A reliable type of fastening, but the most expensive, therefore, an unpopular option. Typically, liquid nails are applied on a small area where a particularly strong bond is needed. If you fix the penoplex with their help along the entire facade, it will turn out to be very expensive. But for insulating a small balcony – a good option.
Important! Professionals do not advise using polyurethane foam for external insulation. It collapses over time and under load in the form of a plate of insulation. In addition, the foam expands, it will be inconvenient to work..
Experts call a mixed method of fixing expanded polystyrene as an ideal choice – the plate is smeared with glue-foam, mastic or a diluted dry mixture, and for reliability it is attached to the wall with fungal dowels. This option provides the longest service life and reliability..
The foam boards are laid as tightly as possible to each other, the second row is inserted into the grooves of the first. It is advisable to seal the joints using cement mortar, glue-foam.